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The lift on a disc immersed in a rotating granular bed
Author(s) -
Debnath Bhanjan,
Rao K. Kesava,
Nott Prabhu R.
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15991
Subject(s) - mechanics , lift (data mining) , granular material , asymptote , asymmetry , physics , cylinder , classical mechanics , geometry , materials science , chemistry , mathematics , composite material , quantum mechanics , computer science , data mining
The discrete element method has been used to study the lift F L on a stationary disc immersed coaxially in a slowly rotating cylinder containing a granular material. In a tall granular column, F L rises with the immersion depth h, but reaches a roughly constant asymptote at large h, in agreement with previous studies. Our results indicate that the argument in some earlier studies that F L is proportional to the static stress gradient is incorrect. Instead, our results show that the lift is caused by an asymmetry in the dilation and shear rate between the regions above and below the disc. We argue that the cause of the lift is similar to that in fluids, namely that it arises as a result of the disturbance in the velocity and density fields around the body due to its motion relative to the granular bed. © 2017 American Institute of Chemical Engineers AIChE J , 63: 5482–5489, 2017